Formation method of lithium ion battery, and lithium ion battery
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A lithium-ion battery, a technology of a formation method, which is applied in the field of lithium-ion batteries and the formation of lithium-ion batteries, and can solve the problems of poor battery cycle performance, poor battery flatness, etc.
Active Publication Date: 2017-04-26
EVE ENERGY CO LTD
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Abstract
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Problems solved by technology
Lithium-ion batteries prepared by existing lithium-ion battery formation methods have the problems of poor battery cycle performance and poor battery flatness
Method used
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Embodiment 1
[0096] Lithium-ion battery formation method, comprises the following steps:
[0097] 1) Standing at room temperature: After injecting the electrolyte, the lithium cobalt oxide battery was left standing at 40°C for 30 hours, and then at room temperature for 12 hours.
[0098] 2) Preformation: 1.2kgf / cm force on the front and back of the battery 2 , and the airbag belt avoids the pressure equipment, and is charged according to the following current:
[0099] First charge at 0.01C constant current for 30 minutes, and the voltage is 3850mV.
[0100] Then charge at 0.02C constant current for 40min, the voltage is 3850mV.
[0101] Then charge at a constant current of 0.05C for 70 minutes, and the voltage is 3850mV.
[0102] Then charge at 0.1C constant current for 150min, and the voltage is 4000mV.
[0103] 3) Standing at high temperature: the battery was left standing at 40°C for 16 hours.
[0104] 4) After vacuum pre-extraction, under the pressure of 1.4kgf / cm 2 , Stand at a...
Embodiment 2
[0111] Lithium-ion battery formation method, comprises the following steps:
[0112] 1) Standing at room temperature: After liquid injection, the lithium cobalt oxide battery was left standing at 40°C for 30 hours, and then at room temperature for 12 hours.
[0113] 2) Preformation: the force on the front and back of the battery is 1.2kgf / cm 2 , and the airbag belt avoids the pressure equipment. And charge according to the following current:
[0114] First charge at 0.01C constant current for 30 minutes, and the voltage is 3850mV.
[0115] Then charge at 0.02C constant current for 40min, the voltage is 3850mV.
[0116] Then charge at a constant current of 0.05C for 70 minutes, and the voltage is 3850mV.
[0117] Then charge at 0.1C constant current for 150min, and the voltage is 4000mV.
[0118] 3) Standing at high temperature: the battery was left standing at 40°C for 16 hours.
[0119] 4) Pre-extraction: Under vacuum, extract part of the gas inside the battery.
[012...
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Abstract
The invention discloses a formation method of a lithium ion battery, and the lithium ion battery. The formation method comprises the following steps: a first standing step, a first pre-formation step, a second pre-formation step, a second standing step, a first air pumping step, a third standing step, a main formation step, a fourth standing step and a complete air pumping step. According to the formation method of the lithium ion battery, the battery cycle performance of the lithium ion battery can be improved, so that the lithium ion battery is relatively good in flatness. By performing the first pre-formation step, the second pre-formation step and the main formation step on the lithium ion battery in a stress state, the deformation of the lithium ion battery in the formation process can be inhibited, the surface flatness of the ion battery is improved, and the hardness is relatively high; and meanwhile, positive and negative electrode interfaces are ensured to be in close contact in the charge / discharge process, the negative electrode interface is free from black spots and lithium precipitation, a good SEI film is formed, and the cycle performance of the battery is remarkably improved.
Description
technical field [0001] The invention relates to the technical field of batteries, in particular to a lithium-ion battery formation method and the lithium-ion battery. Background technique [0002] Lithium-ion batteries are widely used in electronic information equipment, such as mobile communications, mobile computers, electric vehicles, aerospace, military fields, biomedical engineering, etc. With the development of science and technology, people have higher and higher requirements for lithium-ion batteries, such as higher energy density, longer cycle life, and fast charging. Existing lithium-ion batteries generally include a positive electrode sheet, a negative electrode sheet, and an electrolyte. The positive electrode sheet includes a positive electrode slurry and a positive electrode metal current collector, and the negative electrode sheet includes a negative electrode slurry and a negative electrode metal current collector. Lithium-ion batteries using lithium cobalta...
Claims
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